锑磷钼兰光度法测定核酸中的磷

以锑磷钼兰光度法快速测定核酸中的磷，根据测得的核酸磷合量可计算核酸的纯度。     

荧光探针法研究PNA-DNA双链和dsDNA结构的差异

运用荧光和紫外吸收光谱研究了Ru(bipy)2(dppz)^2 和苯胺红T两种荧光试剂与PNA-DNA、dsDNA之间的相互作用．实验结果表明：相同条件下同一荧光试剂与PNA—DNA、dsDNA两者之间发生不同的作用，从而说明了PNA-DNA、dsDNA的结构具有一定的差异，并对引起差异的原因进行了初步的探讨。     

核酸某些碱性三苯甲烷染料体系的RRS及其分析应用

在Tris缓冲溶液中,核酸能与某些碱性三苯甲烷染料如乙基紫（EthyI Violet,EV)、结晶紫（Crystal Violet,CV)和甲基紫（MehtyI Violet,MV）结合而使共振瑞利散射（RRS）急剧增强并产生新的RRS光谱。以鲱鱼精DNA（Herring Sperm DNA,hsDNA)为例考察了其相应的光谱特征、影响因素和适宜的反应条件,体系均在hsDNA浓度为0～2.0μg/mL时与散射强度呈直线关系,方法具有较高的灵敏度,其检出限（3σ）分别为4.7ng/mL（EV-hsDNA体系）,13.0ng/mL（CV-hsDNA）和12.2ng/mL（MV-hsDNA体系）。考察了某些共存物质的影响,并用于全成样品中核酸的测定,获得了满意的结果。     

Thermodynamics of the long range assembly of safranine T on molecular surfaces of nucleic acids

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生命科学及其相关学科的研究(十)

简要介绍了转基因树、人造核酸、活菌生物净水剂、棉花害虫生态治理体系、蛋白质阻止癌细胞生长以及世界上第一头人工牦牛技术开发的进展和产生的效益。     

分子元素与功能核酸分子

 介绍了"分子元素"概念。论述了核酸适体的筛选及其作为大分子药物的应用价值,概述了人工碱基的合成及进展;探讨了脱氧核酶的作用原理,分析了分子信标、分子马达在生物传感、生物合成、生物药物研究等方面的应用前景,展望了核酸分子研究领域的前景及面临的挑战。     

Directed evolution as a tool for understanding and optimizing nucleic acid polymerase function

Polynucleotide polymerases play a crucial role in transmitting genetic information from generation to generation, and they are the most important reagents in biotechnology. Although classical crystal structure analyses as well as biochemical studies have significantly contributed to our understanding of how DNA polymerases function, surprising new insights regarding the importance of certain residues and protein motifs, or of their mutability have been achieved in recent years by evolutionary approaches. Directed evolution has also facilitated the generation of polymerases with tailored substrate repertoires or with stabilities and activities beyond those of their naturally evolved counterparts. Recent new insights in polymerase structure-function relationships and new achievements in the development of tailored polymerases for current methods of nucleic acid synthesis will be summarized in this article. Received 22 April 2005; received after revision 20 July 2005; accepted 27 July 2005     

The hybridization between peptide nucleic acid containing azobenzene and DNA labeled nanoparticle on chip surfaces studied by atomic force microscopy

Peptide nucleic acid containing azobenzene （N-PNA） was covalently bound on chip surfaces. Complementary DNA probes labeled by gold nanoparticles hybridizated with PNA on chip surfaces, The hybridization was successfully detected with AFM by the microscopy mothed. The influences of the position and the cis-trans isomerization of azobenzene unit on hybridization were investigated with AFM.     

谷氨酸菌体核酸释放条件的优化研究

采用均质破碎法、加酶法和自溶法等方法对谷氨酸菌进行破碎试验，以使核酸释放，并对相应的工艺参数及检测方法进行了优化研究。结果表明：自溶法效果最好，当菌液浓度为１％、ｐＨ值为１０、温度为７０℃时，自溶３０ｍｉｎ的核酸释放率达到９２％。     

藏红T与核酸作用的荧光特性研究

低离子强度和生理酸度下,藏红Ｔ（ＳＴ）与核酸的作用随ＳＴ与核酸的摩尔比（Ｒ）变化具有３种荧光特性,表现出３种结合机理．当Ｒ＞０３３,ＳＴ的荧光为核酸线性猝灭,最大激发波长发生紫移,但发射波长不变,是ＳＴ在核酸分子表面进行长距组装;Ｒ在０３３～０１３范围内,ＳＴ的荧光虽为核酸猝灭,但没有线性关系,表现为ＳＴ在核酸分子表面的组装与嵌入核酸碱基对结合处于微弱的平衡状态;当Ｒ＜０１３,ＤＮＡ体系产生新荧光,荧光激发峰红移,而发射波长仍保持不变,对应于ＳＴ嵌入核酸的双联碱基对之间,而ＲＮＡ体系却没有新的荧光产生．